Rotary pump



(Model) A. S. CLARK.

ROTARY PUMP.

No. 246,724. Patented Sept. 6,1881.

ATTORNEYS.

UNlTED STATES PAT NT OFFICE.

ABIJAH S. CLARK, OF TURNERS FALLS, MASSACHUSETTS.

ROTARY PUM P.

SPECIFICATION forming part of Letters Patent No. 246,724, dated September 6, 1881.

Application filed February 5, 1881.

To all whom 'it may concern Be it known that I, ABIJAH S. CLARK, of Turners Falls, in the county of Franklin and State of Massachusetts, have invented a new and useful Improvement in Rotary Pumps, of which the following is a specification.

Figure l is a plan view of my improvement, partly in section. Fig. 2 is a side elevation of the same, partly in section. Fig. 3 is a sectional elevation, taken through the line or m, Fig. 1. Fig.4 is a front elevation of one of the piston-shaft stuffing-boxes. Fig. 5 is an elevation of a part of the case-head.

Similar letters of reference indicate corresponding parts.

The object of this invention is to improve the construction of rotary pumps in such a manner as to make them more durable and effective and avoid the use of adjusting-blocks, plates, packings, or other inside appliances.

The invention consists in connecting the piston-case with the base by screw dowel-pins and screw bolts, so that the case can be adjusted to keep the inner surface of its upper part in contact with the wings of the pistons as the piston shafts wear down in their bear-- ings; also, in providing the piston-shafts with supplementary bearings to prevent the said shafts from springing out of line; and alsoin connecting the piston-shaft stuffing-boxes with the piston-case heads by slotted flanges formed upon the said stuffing-boxes and screw-bolts screwed into the said heads, as will be hereinafter fully described.

A represents the base of the pump, upon the upper edges of the sides of which rest the flanges B,formed upon the sides of the case 0. The interior of the case 0 is made of such a size as to receive the two wheels or pistons D. The pistons D are made with wings or teeth E, and are so arranged that the said wings or teeth E of the two pistons D will mesh into each other. The outer parts of the wings E are inclined or beveled upon both sides, and the angles between the bases of the said wings are enlarged and concaved, as shownin Fig. 3, to give space for the edges of the interlocking wings E to move through. This construction of the wings E allows the said wings to work closer together than they could if otherwise constructed. The pistons D are attached to two parallel shafts,F, which pass through holes (ModeL) G in the heads H of the case O,and have gearwheels I attached to them beyond the ends of the base A, so that the pistons D will be revolved irtopposite directions and at the same speed. One of the shafts F projects to receive the driving-pulley, which pulley is not shown in the drawings. The shafts F revolve in bearings J, attached to the upper edges of the ends of the base A. The shafts F also revolve in second bearings, K, attached to a cross-bar or partition, L, formed upon or attached to the base A, between the ends of the heads H of the case, to firmly support the said shafts and pre vent them from giving or springing. The inner surface of the upper part of the case 0, from about the level of the centers of the pistons D, is so formed that the outer edges of the piston-wings E will work close to the said surface. The lower part of the interior of the case 0 is somewhat enlarged, so that pistons D cannot ride upon its inner surface as the bearings J K of the piston-shafts F wear, and thus allow the said pistons D to move downward. This downward movement of the pistons D takes the wings E away from the inner surface of the upper part of the case 0, and thus lessens the efficiency of the pump. To remedy this difficulty, I lower the entire case 0 as the piston-shaft bearings wear, so as to keep the inner surface of the upper part of the case 0 close to the wings E of the pistons D, by means of the screw dowel-pins M and the bolts N. The screw dowel-pins M are made with their forward or lower parts smooth and with screw threads upon their rear or upper parts, as shown in Figs. 2 and 3, and are screwed into screw-holes in the flanges B, with their forward ends resting upon the bottoms of smooth holes in the edges of the base A, so that the entire caseO can be lowered and raised to adjust the upper part of the said case to the piston D by turning the said screw dowel-pins M. The case 0, when adjusted, is fastened down by screw bolts N, which pa'ssthrough holes in the middle parts of the flanges B and screw into holes in the edges of the base A.

shafts F pass through holes Gin the heads H of the case 0 and through st-ufling-boxes 0, attached to the said heads H. The stuffingboxes 0 have flanges P upon their inner ends, which flanges are fitted accurately against the heads H, and have slots Q formed through them to receive the screw-bolts R that screw into the heads H, so that the stufling-boxes O can be adjusted to correspond with the adjustment of the case (J.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patenta 1. In a rotary pump, the combination, with the pistons thereof, of a casing made adj ustable on the pistons, as and for the purpose specified.

2. In a rotary pump, the combination, with the base A, and the flanges B upon the sides of the piston-case O, of the screw dowel-pins M and the screw bolts N, substantially as herein shown and described, whereby the said case can be adjusted upon the pistons as their bearings wear, as set forth.

3. The combination, with the shaft F, of the heads H,havingenlarged holes G, the stufiingboxes 0, having slotted flanges P upon their inner ends, and the screw -bo1ts R, passing through the flange slots Q into the heads H, as shown and described.

ABIJAH S. CLARK.

WVitne-sses:

H. N. HEALD, A. 0. WYMAN. 

